The Korea Research Institute of Standards and Science (KRISS, President Hyun-Min Park) has developed Certified Reference Materials (CRMs)* that can enhance the reliability of using dried blood spot testing for newborn screening.
* CRM: A reference material that serves as a standard in determining the accuracy of measurements and analytical methods
DBS is a sample obtained by drying a drop of blood from the finger or heel on a piece of filter paper. This approach is used for screening rather than actual diagnosis, as it is less accurate than venous blood sample tests. Its common applications include newborn screening for inherited metabolic disorders and doping control during Olympics.
The proposed CRM provides eight certified values and 10 reference values for amino acids, glucose, galactose, and acylcarnitines, which are diagnostic markers of inherited metabolic disorders in newborns. This allows accurate measurement of the amount of target compounds in the DBS.
The lack of reference values has made it difficult for DBS testing to be considered reliable for medical decision. In addition, there has been a problem with measurement bias caused by the need to retrieve portions of blood spots using a paper puncher.
The KRISS Biodiagnostics Analysis Team found that a 0.4 mm bias in diameter led to a 0.78 μL (one millionth of a liter) difference in sample volume.
The research team controlled the sample volume to 50 μL during the CRM manufacturing stage, and proposed bias-free measurements as certified values, thereby successfully creating CRMs with complete measurement traceability to the International System of Units. This is the first-ever development of DBS CRMs.
Dr. Ji-Seon Jeong, a principal researcher at KRISS, said, “DBS has come under the spotlight as a convenient way of blood sampling, which satisfies the high demand for remote healthcare and home sampling in the days of the pandemic. Our study has laid the foundation to improve the reliability in DBS sample measurement, opening the door for DBS to become an effective tool not only in screening but also diagnosis.”
KRISS plans to develop more CRMs for other diagnostic markers used in newborn screening.
As the representative institute in the national measurement standards, the Korea Research Institute of Standards and Science (KRISS) has been setting the highest measurement standards and ensuring their international equivalence since its inception in 1975. Thereby, we help build solid foundations for the national development in science and technology and for industrial advancements
Funded by KRISS, the study was published in the world-leading journal Analytical Chemistry (IF: 8.008) in July.